wallpapers/image: click image to preview

FEATURE: 403384
FIXED-IN: 5.26

wallpapers/image/imagepackage/contents/config/main.xml

@@ -22,6 +22,10 @@
       <label>Wallpaper image path or wallpaper name</label>
       <default></default>
     </entry>
+    <entry name="PreviewImage" type="String">
+      <label>Wallpaper preview image path</label>
+      <default>null</default>
+    </entry>
     <entry name="FillMode" type="int">
       <label>Sizing, cropping and positioning of the wallpaper image</label>
       <default>2</default>

wallpapers/image/imagepackage/contents/ui/WallpaperDelegate.qml

@@ -119,6 +119,7 @@ KCM.GridDelegate {
     onClicked: {
         if (configDialog.currentWallpaper == "org.kde.image") {
             cfg_Image = model.packageName || model.path;
+            wallpaper.configuration.PreviewImage = cfg_Image;
         }
         GridView.currentIndex = index;
     }

wallpapers/image/imagepackage/contents/ui/config.qml

@@ -208,4 +208,8 @@ ColumnLayout {
             viewMode: NewStuff.Page.ViewMode.Preview
         }
     }
+
+    Component.onDestruction: {
+        wallpaper.configuration.PreviewImage = "null";
+    }
 }

wallpapers/image/imagepackage/contents/ui/main.qml

@@ -53,6 +53,8 @@ QQC2.StackView {
     //private
 
     Component.onCompleted: {
+        // In case plasmashell crashes when the config dialog is opened
+        wallpaper.configuration.PreviewImage = "null";
         wallpaper.loading = true; // delays ksplash until the wallpaper has been loaded
 
         if (wallpaper.pluginName === "org.kde.slideshow") {
@@ -66,7 +68,15 @@ QQC2.StackView {
         usedInConfig: false
         //the oneliner of difference between image and slideshow wallpapers
         renderingMode: (wallpaper.pluginName === "org.kde.image") ? Wallpaper.ImageBackend.SingleImage : Wallpaper.ImageBackend.SlideShow
-        image: wallpaper.pluginName === "org.kde.image" ? wallpaper.configuration.Image : ""
+        image: {
+            if (wallpaper.pluginName !== "org.kde.image") {
+                return "";
+            }
+            if (wallpaper.configuration.PreviewImage !== "null") {
+                return wallpaper.configuration.PreviewImage;
+            }
+            return wallpaper.configuration.Image;
+        }
         targetSize: root.sourceSize
         slidePaths: wallpaper.configuration.SlidePaths
         slideTimer: wallpaper.configuration.SlideInterval